Programming Design & Development
Programming Exercise 4-7 (demo)

Introduce The Program (program description)

A software company sells a package that retails for $99. Quantity discounts are given according to the following table:

Quantity Discount

10-19 20%

20-49 30%

50-99 40%

100 or more 50%

Design a program that asks the user to enter the number of packages purchased. The program should then display the amount of the discount (if any) and the total amount of the purchase after the discount.

(Scroll down for audio clip.)

<<------ Short Audio Clip

To give you an example. Note: I am using the Gaddis Book titled "Programming Logic and Design". The video says from book page 160 ex 5. It is actually pg 169 ex. 7.

The Title is: "Software Sales".

Use this audio clip to get you thinking
Try your own version of Ch 4 Ex 7 Pg 167

Demo the Textbook Approach

A modified version using RC Computing

(intro to Modules)

Goals:

Start with the program we are already familiar with (our non-modular version)
Identify what a module is.
Specify where a module could exist in our program so far.
Setup the main module.
Setup all other modules.
Pull it all together.
This is what I call RC Computing (R for Robinson and C for Carter).

Identify The Modules

Where the separations might go is what you need to consider when setting up modules. We are looking for places we can group things that are similar. Then when we modify code or maybe reuse code it is easier to make the changes because items have similar characteristics. See if you can grasp what I am talking about.

Setup the Main Module

This is an image of the Main Module called (Discount Price) and below it you will see two other modules. One is (Startup) and the other is (Input).

All Other Modules

Remember, all modules other than the Main Module will start with a call from Main. Notice the title at the top of each flow section is an oval with a name in it. The name is the name of the Module, such as (Process). Once a module hits the (Return) at the bottom it will go back to where it was called from. For example, (Process) will go back to the Main Module once it flows down to the (Return) oval at the bottom.

Adding file processing techniques (under construction)

Introduce The Program (new improved)

Flowchart Version using RC Computing

Pseudocode Version using RC Computing

(back to the top)

Reintroduce The Program as New Improved

(program description)

A software company (Gwinnett Software Inc.) sells a package that retails for $99 a unit. Quantity discounts are given according to the following table:

Quantity	Discount
10-19	20%
20-49	30%
50-99	40%
100 or more	50%

Design a program that will read data from a data file which includes the customers name, customer number, date of order and the number of packages purchased. The program should then display customers name, customer number, date of order, price before discount, the amount of the discount (if any) and the total amount of the purchase after the discount. Include totals at the bottom of the report for price before discount, amount of the discount and total amount of the purchase after the discount.

Flowchart Version using RC Computing

(under construction)

Pseudocode Version using RC Computing

(under construction)

Summing things up (under construction)